Beit Yosef Yoreh Deah 257: 9-10

9. The Mordechai (commentary on the Talmud) wrote: [the Talmud, in tractate Eruvin 63a) says] Rav Kahana said, “Anyone who gives all of their gifts to a single kohen (member of the priestly clan) brings anger to the world.” From this, we learn that one should not give all of one’s tzedakah to a single relative, abandoning all other relatives, nor should one give all of one’s tzedakah to a single person and not to anyone else. 10. He also wrote that one who doles out tzedakah must be careful not to give more to one’s relatives than to anyone else. Similarly, elsewhere in the Talmud (Tractate Shabbat 118b), Rabbi Yosi said, “May I be among the collectors of tzedakah and not among those charged with distributing it.” Rashi explained, one who distributes tzedakah is likely to give more to one’s relatives and thereby to steal from the rest of the poor. [Translation by Rabbi Jill Jacobs. Edited for gender neutrality]